关键词: 斜井, 破碎软弱围岩, 大变形, 精细化管理, 滇中引水工程,

Abstract: The control technology of large deformation for fractured soft rock is one of the key issues during the construction of deep-lying tunnel of inter-basin water transfer projects under complicated geological conditions. Limited by topography, geology, investment, construction period and other factors, construction inclined shafts are more and more widely applied for the excavation of main deep-lying tunnel, but the combination of soft rock and inclined shaft construction conditions may bring many difficulties for the excavation and support process. In this paper, taking the No.5 construction inclined shaft of Xianglushan tunnel in Water Diversion Project in Central Yunnan Province as an example, the difficulty factors on the early stage of construction were analyzed, especially for the fractured soft rock and its poor resistance to deformation. By adopting effective measures such as special research test, pertinence design, adaptive construction technique and fine management, the construction progress has been significantly promoted, which can also provide reference for similar inclined shafts in Water Diversion Project in Central Yunnan Province and other tunnel projects.

Key words: inclined shaft, fractured soft rock, large deformation, fine management, Water Diversion Project in Central Yunnan Province,